Imaging apparatus and image synthesis method

Imaging apparatus includes imaging unit that captures a subject image while changing an in-focus position to generate a plurality of pieces of image data, image processor that synthesizes the plurality of pieces of image data generated by the imaging unit to generate still image data having a deeper depth of field than a depth of field of each of the plurality of pieces of image data, and controller that controls the image processor. Controller causes image processor to detect a main subject from an image indicated by one image data in the plurality of pieces of image data, determine a range for synthesizing the plurality of pieces of image data based on a position of the detected main subject, and synthesize pieces of image data focused within the determined range to generate the still image data.